Yes, I wondered also, that in QU documentation it is not really explained. The explanation of all buttons is much more complete in the dLive PDF… Okay, there are some FX-engines, which are not included in the QU-series, but I picked out the included FX-engines… I think, the problem is, that the FX-engines perhaps are not programmed by A&H but by external suppliers? And A&H did “forget” to “update” the FX-engine-section of the QU? Anywy, now I got more information about the QU included features “Delay, Reverb, Phaser, Chorus, ADT-Doubler”… that’s enough for me at this point…